共查询到20条相似文献，搜索用时 500 毫秒
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对于经济批量调度问题,以往的研究主要采用公共周期法和基本时段法,这两种方法花费的成本较高且常常得不到可行的调度。本研究采用批量变动法求解此类问题,并考虑产品保质期因素,采用装箱启发式算法求解产品的生产顺序。对仿真实例的计算结果表明,该调度方法花费的成本要低于公共周期法和基本时段法。 相似文献
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生产调度和设备维护是制造系统中的两个关键问题,两者的目标是统一的,但也存在冲突点,为找到两者之间的平衡点,提出了一种满足可靠度约束的预防性维护和生产调度的集成维护优化模型.以制造系统总生产费用最小为目标,引入可靠度约束条件,通过改善因子来描述预防性维护对设备役龄的改善效果,分别建立了预防性维护和生产调度的独立模型以及两者的集成优化模型.以故障率服从威布尔分布为例,利用遗传算法对模型进行了求解和优化,结果表明,该集成优化策略是实用而有效的,可为生产实际中设备维护计划的制定和生产调度提供决策支持. 相似文献
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采用两阶段法,首先根据多配送中心的特点建立多配送中心车辆调度的数学模型,其次采用模糊隶属度的方法对客户进行分类,确定配送中心配送的客户,并采用改进免疫克隆选择启发式算法进行求解车辆调度的问题,最后结合算例利用MATLAB进行仿真,并与遗传算法进行了比较验证了模型和算法的有效性. 相似文献
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为最大限度地利用风能和太阳能抑制风电力的随机变动性使其趋于稳定态势,并将废弃风力控制在最小限度,研究基于复合发电系统,通过建立风力-光热-水力发电系统的最佳调度模型,并利用富含常驻粒子的粒子群算法优化调度模型参数以求实现最佳的经济效率调度方式。研究结果表明,所提出的风力-光热-水力发电系统能有效地实现风电力顶峰到谷差的稳定化,在确保电力体系处于良好的维稳运行状态基础上,能最大化提高风力发电电力系统的能力,减少水力发电站输出的变动,使整个电力体系的经济效益实现有效提升。 相似文献
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在基于802.16j的无线中继网络中,考虑路由和调度的联合优化问题,最小化系统总调度时间. 首先采用线性规划的方法建立路由,进行链路业务速率分配,然后基于平移和交换思想提出一种链路调度算法. 理论分析证明所提算法的性能在最坏情况下,不会超过最优性能的1.5倍. 仿真结果表明,所提算法的平均性能非常接近最优性能. 相似文献
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针对集装箱码头内装卸桥、集装箱卡车与龙门吊三者对集装箱装卸问题,基于现今码头同步装卸技术的思想,在深入分析研究该项技术在集装箱装卸调度方法的实际应用基础上,结合集装箱贝位协同作业的同步装卸方法,提出了基于堆场混堆的集装箱异贝位同步调度方法,建立了集装箱卡车总行驶距离最小的数学模型,并运用单亲遗传算法对模型进行求解.运用Matlab进行数值模拟,对比传统单程装卸模式的数据,验证了基于堆场混堆的集装箱异贝位同步调度方法的可行性与有效性. 相似文献
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《Journal of The Franklin Institute》2023,360(7):4973-5000
In recent years, regional traffic congestion has become increasingly frequent, which seriously affects the safety and efficiency of urban vehicles. Therefore, traffic flow prediction methods based on artificial intelligence are widely used in traffic management. However, the existing traffic flow prediction methods need to collect raw data, which involves risks of vehicle privacy leakage. Federated learning, which shares model updates without exchanging local data, has gradually become an effective solution to achieve privacy protection. A federated learning traffic flow prediction model for regional transportation systems is proposed in this paper. At the same time, due to the emergence of highly intelligent automatic driving vehicles, a vehicle scheduling system, which can control the departure and routes of vehicles in urban regions is developed in the proposed approach. A road weight measurement method combined with real time traffic information is introduced to optimize the driving routes of vehicles to reduce the average travel time. Additionally, departure strategy, is another factor that has a great influence on traffic efficiency, but is usually ignored in the past, and is also carefully compared and studied in this paper. The numerical results illustrate that the proposed schemes can effectively improve the privacy protection ability of model updates, reduce the scheduling completion time by using the traffic flow prediction model, and realize the comparative research between departure strategies, which provides a reference for developing a safe and efficient regional transportation system. 相似文献
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The problem of stabilization of a linear system that is asymptotic null controllable with bounded control is studied in this paper. By combining the parametric Lyapunov equation approach and the gain scheduling technique, a new observer-based output feedback gain scheduling controller is proposed to solve the semi-global stabilization problem for a linear system subject to actuator saturation. By scheduling the design parameters online the convergence rate of the state can be improved. Numerical simulations for a spacecraft rendezvous system show the effectiveness of the proposed approaches. 相似文献
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Time and space splitting techniques are applied to the Burgers’ equation and the modified Burgers’ equation, and then the quintic B-spline collocation procedure is employed to approximate the resulting systems. Some numerical examples are studied to demonstrate the accuracy and efficiency of the proposed method. Comparisons with both analytical solutions and some published numerical results are done in computational section. 相似文献
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提出了一种静态的软硬件任务划分与调度相结合的算法,可以同时获得给定任务集在该类平台上的软硬件任务划分和任务调度方案. 算法的时间复杂度为O(V(E+V)+V2logV+PVlogV). 实验结果表明了该算法的可行性和有效性. 相似文献
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针对自动调度模式无法充分发挥调度人员经验和有效响应制造执行复杂现场的问题,提出了人机协同模式下的手工调度技术。建立了自动调度与手工调度相结合的人机协同模式;通过调度甘特图的分层显示处理,采用设备出勤模式、鼠标拾取、手工调度辅助提示等技术,实现了调度工序块的离散化面向对象处理;总结了手工调度中指定设备加工、在设备内移动以及设备间转换等三种标准化操作,建立了以零件调度工序链表和设备调度工序链表为核心的调度数据结构,分析了手工调度操作中的调度约束处理步骤,采用重调度方法实现了调度约束满足的一致性处理;以工程应用背景,开发了集自动调度和手工调度于一体的人机协同调度软件系统,并通过实例验证了手工调度技术。 相似文献